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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2873d947c021790fd5559a00ffddcb7ee3ab0a464a0c126cd7a12bda23b5999' 
  AND token = 'PM4pfktiWgqYx/i72mLBOAi8ZYpBHs81aWxoaaYEY10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}